Abstract
In China, owing to the methane concentration being below 0.75%, the coal ventilation air methane (CVAM) is usually emitted directly into the atmosphere, rather than utilized, which not only causes huge waste of energy but also exerts potential hazards to the greenhouse effect. It is important and practicable to save costs of development and investment by simulating enrichment and separation of CVAM with an aim to improve the efficiency and recovery of adsorption separation. Above all, it will have important practical significance to the development of adsorption separation. In this paper, the experiment of the pressure swing adsorption process was carried out on double towers built by our laboratory, and the Aspen Adsorption was used to simulate the process. The effect of the operation parameters on the desorbed methane concentration was studied by altering the feed concentration, the adsorbed pressure, and adsorbed and desorbed time. The results of simulation and experiment are basically consistent. The ratio of methane was decreased following the increasing concentration of the feed. The optimum adsorption pressure and time were found to be 210 kPa and 120 s, respectively. The optimum desorption times of experiment and simulation were 150 s and 120 s, respectively. Because there was a man-made 30 s time lag between the experiment and simulation to protect the vacuum pump, the results show that the simulation and experiment were matched well. Therefore, we can make use of Aspen Adsorption to design separation and enrichment of CVAM, providing theoretical and practical guidance for the gas separation and saving resources and energy.
Highlights
Enrichment and separation of methane by PSA is a dynamic process
When the adsorption pressure continued to rise to 240 kPa, the experimental results showed that the methane concentration was lower than that at 210 kPa, while the simulation results were the same as those at 210 kPa
The results can be summarized as follows: (1) In the simulation, the increase ratio of desorption methane decreases with the increase of methane concentration of feed gas, which is consistent with the experimental results
Summary
Enrichment and separation of methane by PSA is a dynamic process. The parameters of the system, such as pressure, concentration, and temperature, are difficult to measure due to the complexity and variability. The simulation study of pressure swing adsorption can reduce the cost of research and development, reduce the cost of investment and energy consumption, and improve the efficiency of adsorption-separation and recovery. It has importantly practical significance for the development of adsorptionseparation technology. Liu and Ritter [6] considered the whole process of four-step pressure swing adsorption to simulate solvent recovery. In their simulation process, nonisothermal and nonadiabatic treatment conditions were adopted, the change of longitudinal pressure drop in the adsorption tower was ignored. Yang et al [9] successfully simulated the process of separating and purifying H2 from the mixed gas by multibed PSA using the Aspen Adsim software
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